生物标志物 生物标志物
Ying Xia1,2, Vincent Dore3,4, Jurgen Fripp1
1CSIRO Health and Biosecurity, Australian E-Health Research Centre, Brisbane, QLD, Australia.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 25, 2025
概括
阿尔茨海默氏病 (AD) 的进展表明,在早期阶段,无脑缩的情况下,粉样β (Aβ) 积累. 然而,记忆力下降与Aβ积累有关,这表明神经元功能障碍在结构变化之前.
科学领域:
- 神经科学是一个神经科学.
- 神经学 神经学
- 生物医学成像技术 生物医学成像技术
背景情况:
- 阿尔茨海默病 (AD) 的特点是粉样β (Aβ) 沉积和胆固醇基底前脑 (BF) 系统功能障碍.
- 在新出现的AD中,亚值Aβ积累的早期病理变化和认知影响仍然不清楚.
研究的目的:
- 为了研究Aβ积累,大脑结构 (BF和海马) 和最初没有认知障碍 (CU) 的老年人中认知功能之间的关系,这些老年人后来发展出Aβ阳性 (新兴AD).
主要方法:
- 利用了澳大利亚成像,生物标志物和生活方式 (AIBL) 研究中408个CU个体的数据,最初是Aβ阴性.
- 采用线性混合效应模型来分析BF亚区域和海马体的体积变化,以及15年来的认知复合分数.
- 根据Aβ+ (新兴AD) 与剩余Aβ- (稳定CU) 的进展进行分层参与者.
主要成果:
- 69名参与者进展到新出现的AD (Aβ+),而328人保持稳定 (Aβ-).
- 新兴的AD组显示Aβ积累更快,但与稳定组相比,BF或海马缩率没有显著差异.
- 与稳定的CU个体相比,新兴的AD个体经历了更大的记忆衰退,但不是注意力或执行功能,而不是稳定的CU个体.
结论:
- 在新出现的阿尔茨海默氏症中,粉样蛋白-β的积累在基底前脑和海马体没有加速的大脑缩的情况下发生.
- 观察到的Aβ积累和情节性记忆丧失之间的关联表明,Aβ相关的神经功能障碍可能会在可检测的体积大脑变化之前发生.
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